If you're looking to burn calories, lose body fat, and gain muscle, this 45-minute HIIT workout, designed by ACE-certified fitness instructor John Kersbergen, is all you need to maximize your gym time and effectively lose weight in the shortest amount of time.
Equipment needed: jump rope (if you don't have one, just pretend!), and medium- to heavy-weight dumbbells (five to 20 pounds)
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